No need for a snatch block unless you are using a winch. The only time I have had to use one was to "double the power" of my winch when my brothers Toyota was in thick mud up to the doors. To do that you just hook up a strap to the vehicle needing recovery and attach the snatch block to it, then run the winch from your vehicle to the snatch block, then back to winching vehicle.
As for what you need in MOAB.... probobly just a cheap 10' and 25' strap that have loops at the ends and 2 shackles. Stretchy straps are nice since they don't give the big BANG/JERK when the strap tightens but the normal straps should be just fine.
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......